Among the many advantages of stone is one very practical one.
在石的诸多优点，是一个非常实用的。
The electric bridge has advantages of simple circuit, good teaching effect and high practical value.
电路简洁，教学效果好，实用性强。
The electric bridge has advantages of simple circuit, good teaching effect and high practical value.
电路简洁，教学效果好，实用性强。
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